Fever in the compromised host.

Fever in the compromised host remains a significant clinical problem. Multiple potential pathogens, subtle physical findings, and a variety of noninfectious problems that may masquerade as infection contribute to this clinical challenge. A review of host defense defects along with a careful physical examination will begin to narrow the etiologic possibilities for fever. Recognizing that the majority of infections will represent as fevers of unknown etiology, a consistent approach to the patient who responds to empiric antibiotic therapy as well as to the patient who fails to respond should be developed.